Power Flow Simulation And Reactive Voltage Optimization Strategy For Active Distribution System

In recent years,In the context of fossil energy shortages such as oil and coal and global warming,The energy crisis is deepening worldwide.Energy conservation and the development of a low-carbon economy have become a topic of common concern around the world.The strong support of countries for the development of renewable energy has gradually increased the penetration rate of distributed generation in traditional distribution networks.Distributed generation has unique advantages including economics,environmental protection,flexibility and safety.These unique advantages make the development of distributed generation bring many good influences to the power distribution system.At the same time,the development of distributed generation also brings challenges to the planning and analysis of power distribution systems.As the distributed generation accesses the distribution network,the structure of the distribution network has undergone a fundamental change.This structural change has a significant impact on the reactive voltage characteristics of traditional distribution networks.Traditional reactive power compensation control is difficult to adapt to the structure of the source distribution network.In this paper,based on the distributed generation output characteristics and the grid-connected interface type,the power flow calculation model of the source distribution network is established,which lays the foundation for the engineering simulation model for the power flow calculation of the distribution network.Secondly,the mechanism of the influence of intermittent distributed generation access on the reactive voltage characteristics of distribution network is analyzed,and the early warning evaluation and evaluation algorithm for voltage fluctuation of source distribution network is proposed.Finally,a coordinated optimal operation method for power equipment of source distribution network based on mixed integer convex programming is proposed.The secondary cone relaxation is applied to the node power balance constraint.Taking the distribution network in a certain area of Foshan as an example,the simulation analysis is carried out.The simulation results verify the accuracy of the secondary cone relaxation in the mixed integer convex programming model and have a certain reference function for solving practical engineering problems.